<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <script>
    // 转换为布尔型
    console.log(Boolean(1)); //true
    console.log(Boolean(0)); //false
    console.log(Boolean(NaN)); //false
    console.log(Boolean(undefined)); //false
    console.log(Boolean(null)); //false
    console.log(Boolean('')); //false
    console.log(Boolean('123')); //true
    
    

  </script>
</body>
</html>